Office swivel chair



FIG. 1 is a front elevational view of an office swivel chair showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side perspective view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an office swivel chair, as shown. 